We wanted to do this at a news site I worked for (since we had way too many cookies) but the problem was Google news. On Google news thumbnails would not be sh

We wanted to do this at a news site I worked for (since we had way too many cookies) but the problem was Google news. On Google news thumbnails would not be shown unless they came from the same domain as the other page. So our content was on "www.example.com" and pictures were on "media.example.com" but the cookies were for "example.com" so got sent with every image request.